Ответы на вопрос:
1) x+y=1
x-y=5
x-y=5+y
5+y+y=1
y=-2
x= 5-2
x=3
(x,y) = (3, -2)
2) 2x-7y=39
x+y=-3
x+y=-3-y
2(-3-y)-7y=39
y=-5
x=-3-(-5)
x=2
(x,y) = (2, -5)
3) 5x-2y=-12
3x+4y=-2
(x,y) = (-2, 1)
4) x+2y=5
-x+7y=-13
(x,y) = (1, 2)
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